Looking good Jon!.. good guess about the air supply pipe but not quite right.. pedantic, I know but it actually exits from the nose through the top plate of the buffer beam not through the beam itself.. all the airbrake pipework runs vertically down (through the nose floor) the rest from underneath it (Vac, Steam and ETH(S)).. not that it makes the slightest difference in 4mm of course!.. it's well hidden under the nose and by the time its painted you can't tell where its attached!
Keep up the good work!.. it'll almost be a shame to paint it
Detailing a Deltic - Buffer beams and slowly getting the look right - P4 Deltic Pt 10
in Jon020's Workbench Blog
A blog by Jon020 in RMweb Blogs
Posted
Looking good Jon!..
good guess about the air supply pipe but not quite right.. pedantic, I know but it actually exits from the nose through the top plate of the buffer beam not through the beam itself.. all the airbrake pipework runs vertically down (through the nose floor) the rest from underneath it (Vac, Steam and ETH(S)).. not that it makes the slightest difference in 4mm of course!.. it's well hidden under the nose and by the time its painted you can't tell where its attached! 
Keep up the good work!.. it'll almost be a shame to paint it