Hello dovetail. I would like to inform you in case you may not aware. Since the new Long island update/new route. I noticed certain numbers of M7 LIRR cars hasn't been upgrade to the new LIRR version. When I spawn 8cars and 10cars M7 LIRR I've noticed those train has door control and breaker behind the driver seat you may have missed. You might want to get someone to take a look on the M7 LIRR spawn list to make you didn't miss any old versions that not supposed to be there.
So on free roam you can spawn both old or new M7 version if you have the original LIRR. The way to tell them apart is the word "Car". The new version is the "C" is in capital letter. on the original is a lower "c" hope this information helps