My kids (5 and 3) wanted to play trains yesterday so I let them have at the "layout" (just under 4x8). One O42 oval, one O31 oval of Realtrax with a few internal sidings. The O42 had a Railking SD70Ace from a starter set and five cars and the O31 loop was sporting a Lionel Lionking basic GP - I think a GP 20 - with four cars. In any event, the kids ran those things flat-out for two full hours with only a few stops here and there and screaming the entire time, having a blast. ZERO derailments somehow, not even when the 3-year-old dialed up full astern. By the end, the trains were squealing like pigs but the kids were happy as can be. Much to my surprise, the Railking loco had a much higher top speed.
Now I know most of us usually run the trains a lot slower, but I think that may be the most prototypical use ever of my railroad. Now my rolling stock badly needs maintenance due to sustained high-speed operation. What's more prototypical than that?