Not to nitpick..but you care about the railway rifle...why? Its a junky piece of..well..junk, just like all the other 'build it yourself' weapons with the exception of the nuka grenade (which needs converted to use regular cola or else a mod to add about twice as much quantum), and the deathclaw hand...and ....MAYBE...the dart gun (good for sneaky types).
Instead of worrying about Moiras mad little inventions, tell that twit to bugger off and install Weapon Mod Kits. Your computer will thank you. Especially if you are like me and cant use FOOK reliably without massive constant crashes. (no idea why).
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SPEAKING of which. Does anyone know why, and if there is a workaround for, crashing on quicksaves at/near/around/within farting distance of: Project Purity while playing BS?
The railway rifle has a very high ratio of limb damage thanks to a 3x limb damage multiplier. It's very handy for softening up the heavier muties: A spike in each arm and a spike in a leg makes a mutie effectively cannon fodder because they're now slow (on top of being big targets) and their aim is pretty much crap. With its crit multiplier, it has 3x the chance of doubling its already massive limb damage.
All of the make-it-yourself weapons at least verge on the border of being overpowered, while some even cross it (Shishkebab, Nuka Nade/Bottlecap mine with more than one schematic, dart gun).
Deathclaw gauntlet is balanced out by the fact that its armor piercing only works when the opponent actually has armor (as in... not like Mirelurk carapaces).
Railway rifle is balanced out by its slow projectile shot making its range limited.
Rock-it launcher's versatile ammo source is balanced by the fact that its ammo takes up weight.
Shishkebab is unbalanced because it deals way too much damage way too quickly
Bottlecap mine is unbalanced because you can make more than one if you have improved schematics (how does one get two lunchboxes out of one, exactly?)
Same goes with Nuka 'Nades (and their tin can containers)
And the Dart Gun.... makes Deathclaws, something that should make you either apply excessive force or flee in fear of your life, an absolute joke.