To Make things a bit easier you can make up templates of the curves your will be using, that way the establishment of the right of ways will be much quicker and easier.
Templates are very useful when going around an outside corner where a trammel cannot be used.
Everybody's templates will be different depending on their application. Building my branch line RR, the templates range from 49" to 76" radius.
Note the gradual transition from tangent to full radius.
