Does any one know where I can buy omega rail brackets. I am trying to block up a 2 stop Dover car to replace jack. If not have to land the car on I beams and keep top floor doors open and build a construction wall outside entrance. Does any one have any other ideas ?

Conventional jack? Could you drill two holes in the top of each of your guide rails for shackles and sling the bolster channel on each side next to your bottom guide shoes to hang the car?

I have 3 sets of these from advance welding service

https://advanceweldingservice.com/omega-rail-lifting-system/

Nice!