Tinker

Does it make a difference, simple answer not tried on my rolling road but on a small oval roughly a hour each way and the loco is certainly smoother running and speeds up a bit.....

Some superb weather just a point for people to make a note of the cab windows would be kept clean there were cleaners on Loco Sheds  waiting to progress to Fireman/Secondman that's all i did for first months of  employment 

I used a 6 way Tam Valley Hex frog Juicer on  my 3 way points, connection are DCC bus wire to the 2 inlets then there's 6 single frog wires just run a wire to each frog, job done.......

http://www.coastaldcc.co.uk/products/tamvalley/hex-frog-juicer-universal

Class 33's would hunt left and right the track condition never helped, Class 73's bounced up and down on a rough track hitting the bogie going down and it was only the chains stopped it jumping off the pin on up movement, as said 47's wallowed left and right how bad, well on the down slow at St Mary Cray  through the station on a slight right curve the loco would go over to the left and as it traveled over the viaduct i could look down and see all the brickwork to the ground very slowly it came back up, Class 09's just about stayed on the track at 27-1/4 mph bone shakers to the extreme......