>>25501136
Basically a bunch of solenoids in series that get switched on and off in sequence. Railguns are cooler because they have sliding armature and high amperage and stuff.
>>25501142>inefficient
Probably because when your ferromagnetic projectile passes through the solenoid it induces a current in the solenoid that acts to slow the projectile down, like when you drop a magnet down a copper tube.