Last session, my players decided they needed a MG after their hideout got assaulted by some gangers they pissed off. So naturally, they used their contacts and found a guy who contracted the party to rob a Lone star mag train filled with weapons and an "asset" that the Mr Johnson wanted.

The runners came up with a plan (which took nearly while session, thankfully). Which consisted of them gathering info, getting costumes, scouting the rails, etc. We initiated phase 1. They disabled the mag system, dropping the train to regular tracks, before blowing the bridge. This fixed the rigger train conductor to stop the train, allowing the players to run up.

The troll used shape metal to open a ramp inside before the dwarf rigger sent in his 4 drones to clear out the second car. They swiftly took out these guys, but not before one of them called in a report and sent the train on lock down.

We left off with the troll sealing up the hole, and sealing the door to the engine room. Also the summoner mystic adept summoned a force 5 earth elemental with acid attacks to melt through the doors.

The room they're going into next contains the "asset" a young elf Who has been genetically engineered to be a super weapon.

After that, what could I throw their way? And what would the train be equipped with? I know lone star can get some shit but I don't want to just outright kill the party. Also, what can they expect with reinforcements coming in?