the carcasses are just prop_statics set to nonsolid. i tried tying them to the rails with a couple of different entities, but they'd just swing about all over the place and if they hit you you'd lose about 20hp. ragdolls might've worked but they'd affect performance too much so making them non-solid is the only real alternative.
[Blocked Image: http://img40.imageshack.us/img40/6675/l4dsvabattoirb30028.jpg]
[Blocked Image: http://img269.imageshack.us/img269/6141/l4dsvabattoirb30027.jpg]