What mechanical function do barrier springs serve on the R44 and R46 trains?

The mechanical function of barrier springs on the R44 and R46 trains is essential for preventing inter-car access. These springs are designed to create a barrier that ensures passengers cannot move freely between train cars when the train is in operation. This goes a long way in enhancing safety by minimizing the risk of accidents that could occur if passengers were allowed to travel between cars while the train is moving.

The use of barrier springs facilitates a clear separation between the train cars, which is especially important in situations such as emergency braking incidents, where movement between cars could lead to injuries. The design leverages mechanical tension to maintain a secure closure of the inter-car doors, thus reinforcing this safety feature.

Other options suggest functions like aligning or locking doors, controlling speed, or facilitating access, but the primary focus of barrier springs is specifically related to their role in restricting access between train cars, which is critical in the overall train safety mechanism.