DCC friendly that the connections to the motors and pickups are separate and use connectors readily available.
Not friendly by virtue of incandescent bulbs of multiple and weird voltages and also the use of bidirectional leds etc.
My screws last a long time if they are removed without damage, and the threads are lubed and not overtightened when replaced, and put back into the same threads. Find a screwdriver that fits the heads exactly, and label it and use it only.
in my experience the axles with traction tires crack before the ones without. I got rid of all the traction tires, when when it stalls the wheels spin.
Greg