for anyone who hasn't seen the wizardry the train path finding engine now has.. check it out, it is 100% amazing. finally its like having an *intelligent* signaller telling the flipping things when they can go. given a loop, and trains only going one way (say three stations or one signal) you no longer need worry about blocks..
huge mainlines need only the signals at junctions now, your track runs at capacity!!!
this i like..
a *huge* thankyou to the wizards behind it all.