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Two vehicles with automatic couplers coupled the moment they touched, in CouplerForce(), before CollisionDetect() ran; its derail check only covers uncoupled vehicles, so they never collided nor derailed, at any speed. With crash damage on, the coupling now waits for a closing speed of at most 15 km/h, the limit of the derail check. A faster hit locks the automatic coupling until the vehicles part, so the collision runs its course instead of the couplers catching once it has slowed them down. Two collision bugs on the way: - CollisionVelocity() took the length of the difference of the heading quaternions times the speeds; a quaternion turns by half its angle, so for vehicles facing each other the speeds came out at right angles: a head-on hit at 10 + 10 km/h read as 14.1 km/h, under the limit. The closing speed is now taken from the touching ends, as CouplerForce() relates the vehicles: the sum of the speeds head-on, the difference rear-end, negative when the ends part, - CollisionDetect() gave ComputeCollision() the other vehicle's speed along that vehicle's own axis, which points the other way for vehicles facing each other: a wagon hit head-on counted as running into the hitter, and the hitter bounced back as from a wall (20 km/h into a standing wagon: it ran off at 6 km/h instead of 17). The speed is turned into this vehicle's frame and back. Head-on hits now count with both speeds, so with crash damage on they derail sooner than before, at the 15 km/h the check was meant for. Tests: test::pair runs two test vehicles on one track the way vehicle_table::update() runs a scene (neighbours, forces, movement), with coupling, buffing, collisions and derailing coming from the physics. tests/unit/test_couplers.cpp: catching up to 15 km/h and not above; a slow hit couples, a fast one doesn't, nor once slowed down, the lock resets once the vehicles part; a hit a little over 15 km/h bounces apart on the rails, harder ones derail; head-on 7 + 7 couples, 8 + 8 bounces, 15 + 15 derails; no catching a coupler of another type, couplers of different control systems couple without the control connection.