Are you talking about the Railwaves 377? If so, what do you mean by locking the doors? The doors as far as I know, are automatic and cannot be locked. A few more details might be helpful.
Ah, I believe you're referring to the Railwaves description that mentions
[FONT=tahoma, arial, helvetica, sans-serif]"Operational Door Lock and Open Lights in Cabs (side specific)"? [/FONT]
[FONT=tahoma, arial, helvetica, sans-serif][/FONT]
[FONT=tahoma, arial, helvetica, sans-serif]If so, then this only refers to the lights in cab view wich 'illuminate' as per the prototype. You can't physically lock the doors.[/FONT]