Prototype track-work is flawed....so mine is too. 
I took this pic on the old B&O nee BR&P Indiana (Pa) branch which is now a NS branch serving a power plant:
The use of telephoto for both pics accentuates the poor track alignment but it is real.
I know, I know. The conventional wisdom is that our [model] track-work must be flawless but every time I watch a PER train rock&roll over that bit of track it makes me remember all the poor branchlike track-work I've watched trains roll over.
It's different strokes for different folks, isn't it? 
