Even though the red line is local to me and I know about it, you have to put more information for those who don't know the route. Players have to know what's soo special about it, why those particular units, any pictures, length, route map, etc.
If you want people to take this seriously you must provide more info. Take a look at the most viewed suggestions to get a sort of template.
K da reason why I want the dc metro route well let’s yellow for example first of there is not a lot of subway line sin the game second of there not even an American subway not one third it’s one of the best subways in the Us with Breda 2000 3000 and 6000 cars and the 7000 series it would be nice if there was another subway my suggestion is the red line from glenmont to shady grove
I mean the dc metro is big I get that and it would take time but come on why not add at least ONE American subway
You are correct here is my template https://docs.google.com/document/d/1cGw_uEVaHiROjbLtuKKp1g0GPASK12lbPUToojjtAk0/edit?usp=drivesdk Train protection system Washington Metro automatic train operation
The link you sent requires permission to access btw. ATO hasn't been used since 2009 b/c it caused 2 metro units to crash into each other. However, they are currently talking about bringing it back.
Thanks for the link I have it set to Public now https://docs.google.com/document/d/1cGw_uEVaHiROjbLtuKKp1g0GPASK12lbPUToojjtAk0/edit this is my template for suggestions