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(Dedicated server, SteamCMD)
Railgun have a model problem
Here is a youtube video for how to add addons on a garry's mod server:
https://www.youtube.com/watch?v=WaRTxiXJv8g
The OP also made other usefull garry's mod server tutorials.
[ERROR] gamemodes/terrortown/entities/weapons/weapon_rp_railgun.lua:244: attempt to perform arithmetic on local 'recoil' (a nil value)
1. BfgFire - gamemodes/terrortown/entities/weapons/weapon_rp_railgun.lua:244
2. unknown - gamemodes/terrortown/entities/weapons/weapon_rp_railgun.lua:181
2 screens for you so you can saw what i meant
http://images.akamai.steamusercontent.com/ugc/507027582304082286/DFA1237175D144283ACFA5879FBFFB0F98249192/
http://images.akamai.steamusercontent.com/ugc/507027582304082712/7C6F39298F9E177DD542CFF8283C13B7AE966C4D/
If you want them individually, I think I authorized someone to do it some time ago, so try to search for the weapon names and maybe you'll find them.