novelsite Chapter 19 Train Driver's Cab
Chapter 19 Train Driver's Cab
In the demonstration footage of the construction process, the driver's cab was disassembled into dozens of components.
"The first step is the overall reconstruction of the outer shell." Wang Zhengyang zoomed in on the original inner structure of the skin. "The original 2.5 mm aluminum alloy skin will be retained, but only as an airtight layer and mounting base. On its inner side, an 8 mm thick Q345B rolled steel plate will be fully laid and glued."
He pulled up a construction simulation video: a huge steel plate was lifted by a vacuum suction cup, with a uniform gray adhesive layer applied to its back. "DIN 6701 standard aerospace-grade structural adhesive, two-component epoxy resin, open time of 25 minutes after mixing. Coating thickness 0.8 mm, tolerance ±0.1 mm. After bonding, a custom airbag system is used to apply a uniform pressure of 0.35 MPa, which is then cured for 24 hours."
The image displays a pressure distribution cloud map with an almost uniform color gradient. "The adhesive strength will reach more than 85% of the base material, meaning a tensile strength of no less than 535 MPa. But that's not enough."
On the 3D model, a regular grid of dots appears on the surface of the steel plate. "Through-through reinforcement is carried out using 10.9 grade M12 high-strength bolts at 25-centimeter intervals. The pre-tightening of each bolt is divided into three stages: initial tightening of 70 N·m to eliminate gaps, secondary tightening of 140 N·m to establish the basic pre-tightening force, and final tightening of 280 N·m to reach the design value. Each stage is spaced 15 minutes apart to release material creep."
Wang Zhengyang brought up the torque monitoring interface: "All bolts are tightened using digital torque wrenches. The data is transmitted wirelessly to the construction management system in real time, automatically generating torque-angle curves. Any unqualified tightening process will trigger an alarm, the bolt must be removed and replaced, and the hole position will be invalidated."
Chen Yishang gasped: "These standards... are even stricter than shipbuilding standards."
"Because the working conditions we have to endure are more complex than the pressure of the deep sea." Wang Zhengyang said expressionlessly, "An additional 5 mm steel backing plate is added to the front windward side, with double-layer adhesive bonding and mechanical fastening. From the bottom of the portholes on both sides to the chassis area, 12 mm thick military bulletproof steel plates are added, installed at a 45-degree angle."
Lin Luo'er asked softly, "How much will the weight increase if we do this?"
"This steel plate alone weighs about 2.1 tons," Wang Zhengyang said, pulling up a weight distribution chart. "But that's not all. Key protected areas need extra reinforcement."
The camera focused on the front and sides of the cab. "On the front windward side, an 8mm base plate is reinforced with an additional 5mm steel backing plate of the same material, using the same double reinforcement process. From the side windows down to the chassis area, 12mm thick military-grade bulletproof steel plates are installed at a 45-degree angle."
He demonstrated a ballistic simulation animation: a simulated 7.62mm rifle bullet, traveling at 850 meters per second, struck an inclined steel plate, leaving blinding sparks as it deflected. "This angle transforms vertical penetration into an oblique slide, which, combined with the steel plate's hardness, effectively resists direct fire from small- to medium-caliber rifles. According to the simulation, the protection distance of a 12mm inclined steel plate against 7.62×39mm steel-core bullets can be reduced to within 50 meters."
Chen Yishang fell silent. He stared at the ballistic data jumping on the screen and finally realized what this train was going to face in the future.
"Second item: Internal protection and safety cabin." Wang Zhengyang switched the view to the interior of the driver's cab. The original driver's cab was spacious but rudimentary, with only two ordinary seats and a basic dashboard.
The new design is futuristic and gives a sense of security.
"First, spatial reconstruction." In the 3D diagram, the cockpit is re-divided into three areas: the driver and co-driver's seats on the left, the central control console, and the commander's seat on the right.
"The driver's seat has been completely upgraded." Wang Zhengyang zoomed in on the seat structure. "It uses an all-steel frame, with a flame-retardant cushioning material covering the surface. The seat belts have been upgraded to a six-point harness—covering both shoulders, hips, and legs—to firmly secure the body to the seat and prevent injury from impacts in any direction."
"Control console protection." The screen focused on the dense array of instruments and buttons. "All critical control buttons—power switching, braking, weapon control—are equipped with flip-up metal protective covers. Normally, the covers are closed to prevent accidental activation; when operation is needed, a light touch of a finger on the capacitive sensor on the side of the cover will automatically open the cover, and it will automatically close again 3 seconds after the operation is completed."
"In an emergency," Wang Zhengyang added, "you can smash the fragile cover on the side of the enclosure with your fist and directly operate the hard-wired backup button below—this is the last resort."
"The rear partition wall has been reinforced." The camera pans to the rear of the cab. "This wall is the final boundary of the cab's safety compartment. The original structure was just a lightweight partition, which has now been replaced with a 15mm thick Q550 high-strength steel plate, welded to the chassis frame as a whole. A sealed door has been opened in the wall, with the door structure being of the same level as the side wall, equipped with a hydraulic locking and manual unlocking mechanism."
He paused for a moment: "Most importantly, the entire cab forms an independent positive pressure sealed environment. There is an independent air supply system that can draw air from outside the vehicle, filter it through three stages (particulate, chemical, and biological) before sending it into the cab, maintaining the indoor air pressure slightly higher than the outside pressure. This way, even if there are toxic gases or biological pollutants outside, they cannot seep in."
Chen Yishang had already filled more than a dozen pages of notes. He put down his pen and rubbed his temples: "Dr. Wang, these modifications... the calculations of weight and center of gravity..."
"Here it is." Wang Zhengyang was prepared and pulled up the complete balance report.
A 3D model of the Longyuan locomotive's front end appeared on the screen, with different colors indicating the weight of each component. As modification projects were added one by one, the model's center of gravity slowly shifted.
"The original vehicle weighed 82 tons, and its center of gravity was located here." A red dot appeared at the front of the model. "The first layer of steel plate was added by 2.1 tons, the front was reinforced by an additional 0.4 tons, the side armor plates by 1.2 tons, the internal reinforcement by 0.8 tons, the seats and console by 0.2 tons... The total weight increase from the cab modification is approximately 3.6 tons."
Chen Yishang frowned: "How much has the center of gravity shifted forward?"
"A longitudinal offset of 1.8 meters is equivalent to the center of gravity shifting forward by 4.2% of its original position," Wang Zhengyang said, pulling up the calculation data. "This is dynamically unacceptable. Therefore, we need to balance the system."
The scene changes, and a counterweight appears at the rear of the train. "At the rear balance compartment of the eleventh car, a 2.8-ton modified transmission and running gear compartment is installed. This can also provide maximum counterweight within a limited space."
The position of the counterweight was slightly adjusted, and the center of gravity on the screen slowly moved backward, eventually stabilizing 0.2 meters behind the original position.
"Final results: longitudinal center of gravity offset is controlled at +0.5% of the original value, and lateral offset is +0.3%." Wang Zhengyang presented the railway dynamics simulation results. "After the modification, the maximum safe speed of the Longyuan train on standard gauge has slightly decreased from the original 120 km/h to 118 km/h, which is completely within the acceptable range. Lateral stability, derailment resistance coefficient, curve passing performance... all indicators meet German railway operating standards."
Looking at the complex curves and data, Lin Luo'er said softly, "This computational workload...it must take a supercomputer a very long time to run, right?"
"It took me three nights," Wang Zhengyang said simply, without explaining how he used his supernatural abilities to speed up the calculation process.