Guide to H1 - Texas train station

To travel to this heist, you must have the 'Texas train station' plan IN YOUR TRUCK, which (as the location hints for the heist location tell you) can be found in Lakeside St. either 208 (in the cabinet downstairs or in the frontward room) or 211 (in the side room that often has upgrades).

The arrival points (truck locations) are at the base of the biggest 2 arrows, with "front" being on the left and "back" being on the right.

The entire facility is surrounded with a big chainlink fence, with the arrows pointing to the security checkpoints you're meant to enter the facility through. There's also an unlabeled hole in the upper-left corner of the fence ("west" of building B) that you can hold E to cross.

There are 2 storage buildings, A and B, and a big warehouse in the middle (C). There are also 3 traditional guard houses, but only the one on the right (2) is really noteworthy.

This guard house contains a safe and a notebook on the desk with the passcode for the Camera security panel.

This storage building is one big room. A window alarm keypad is in the corner (it only covers this building!), and the doors are master-level locked. There are also 2 smashable crates. The single simple-locked desk contains a notepad with a passcode that probably works on the window alarm keypad.
Watch out for the tripwire trap! It can be on either side of the shelves.

This building consists of 2 rooms, with the "northern" upper storage room (see right), which contains the window alarm keypad (only for the windows in this building) and a tripwire trap,
while the "southern" one (see left) containing a bunch of desks and the laser keypad (which I don't think has a note atm)

All the doors are master-level locked.

The warehouse in the middle of the map has 2 laser gates that guard the staircases up to the rafters, which hold the Camera security keypad for the whole map. The laser gates can be deactivated via the keypad in building A.