This map is a partial port, I've made for Half-Life: Deathmatch. Honestly I was just bored, so I loaded up HL2:DM and I decided to change an already existing map from HL2 into HL2:DM and trainstation map was the ideal for me.
I hope you guys will enjoy playing it as much as I enjoyed making it! :)
I did a similar idea with a hl2 map to build overwatch instead of using the cut-down version that the multiplayer overwatch is. It took me a while to add all the weapons and make all the custom goodies.
I didn't want to discourage you, I just gave you some tips to make the map more playable. HL2dm is the only game I play regularly, I know its gameplay. Such a large map requires several players, and having only one AR2, only one 357 and one RPG with few ammo, and most of all without healhkits and batteries to recharge itself is frustrating. What do you do when you're out of ammo?
To better understand what I mean, you can take a look at my alcys_c17 map, here in Gamebanana. I did something similar to yours, but with another HL2 area, and adapting the map to fit the DM gameplay.
It seems like you have just removed some elements from the original map, without adding all the stuff needed to play a Deathmatch. In such a large map there are only 1 rpg, 1 357 and 1 ar2, with very few ammos. No shotgun (but ammos for it), no crossbow, no healthkit, no battery. The doors of the station are opening inside the wall. Last but not least, the cubemaps are not built for LDR. You must release a full cubemapped version, because if I build the cubemaps, the map looks better, but I can't play it on a server running the not cubemapped version, because the file size is changed. A good idea, anyway, but needs some more work to adapt the map to the DM gameplay. Cheers.