Hi folks I am looking for an overview of the way the coded cab control and acknowledge switch were used during the steam era. on the UP The coded cab control appears to have four lights ? Apologies if I have the names incorrect but that is the information I have gleened so far. The information is required to attempt to get some authenticity into a computer model of a large US steam prototype that is nearing completion for a Railroad Simulator. Regards Sly (UK)
