thanx daniel, thats a great idea that i will try. the ptfe was a test to see if it would improve smokebox vacuum, and i believe it certainly has. i had a superb run for an hour this morning, pulling up every 4 laps for coal and topping up the water until it splutters in the blower, which is now more effective after i reduced its aperture. felt like i had complete control of everything this time. after pumping in 1.5 litres of water i now have "goodall wrist" pain, so need one of steves high capacity bottles instead of this daisy watering thing i have. she turned 3/4 of a jamjar of anthracite into a tablespoon of ash and was pulling my dragwagon, made so i dont have the hassle of unloading and coupling all the wagons every time i want a quick run. i can load it with weights and i have wooden pads sprung against the axles so it simulates a train load but doesnt look as impressive. will put some pix in the gallery. if you go to photo galleries button on top of this page daniel, then click on random galleries, and finally click on green park icon, you should find my pics. thanks again for advice, martin....