You can use the m16 grenade launcher to blow off the hatch with 2 or 3 grenades. Make sure to aim specifically for the hatch that falls off otherwise it might not register the hit. It's also possible to do with regular grenades, but it's a lot more difficult. It's supposed to be a skip for speedrunners but it comes in handy if you get softlocked.

Head to your load game menu and select an older autosave from before you enter the massive train station area. If you do not have an autosave like that then press your ~ key and type in the console "map a1c3p6_station". Once the level is loaded make sure to follow Cue and only pass through the gate once Cue has. Once Cue is in the large train station area, everything should be fine as he will be able to get to his spot to let you start the opening hatch sequence.

With the game closed right click on the game in your steam library, click on properties then select betas. Once in the betas menu click on the drop down box and select the build called "owf_staging_prep". It's the most stable and public build of the game, the softlock is also fixed in this build so you don't have to worry about it. Old save files won't work so to get back to the train station level in this build press your ~ key and type "map a1c4p4_station" in the console.