Train will not run

[Stewart Train]

New train ran a few minutes then quit. Everything looks good. Going to check power from transformer. What is voltage ?

[Doneldon]

Stew-

It depends on the scale. HO and N use 12-16 volt DC. "O" uses AC but I don't recall the voltage anymore. Large Scale uses DC, around 18 volts. Any model railroad power supply will tell you its output, including amperage which is the supply's capacity for running more than one train.
                                                                            -- D

[John Bud]

i have O scale Witt Streetcar. 

will run, but when i reduce speed to 0 and it stops, it wont resume.  Cant change direction either.  One it stops,  i have to pull the plug on the transformer.

thoughts?