to my knowledge oa_base3 doesnt have a rail.
and on czestmyr i would like to point you to that nice little lightning gun right next to the spawn points. it takes 2 hits with rail after spawning to kill so you have time to run and grab it. then either kill them or run and get health in the basement. but in that little area i would place my money on the guy with lightning over the guy with rail no matter lighting guys health