I met a french lad in Bolivia who was disgusted with himself that he had got the train because of lack of information on the road to Machu Picchu so I thought i would update this thread.

Biggest change is the bridge just before the Hydro station is currently not passable. There is a box girder bridge in place but no entry and exit ramps just yet. The workers are getting off their busses, crossing a foot bridge and getting into a bus on the far side. This obviously causes difficulty with parking a bike at the hydro or checkpoint.

From Cusco the road via Pisac is very good tarmac in the dry [non porous so very slippy in wet]. If you don't like constant switchbacks i suggest you get the train though.

Santa Maria to Santa Teresa is dirt as previously stated. One deeper unconcreted river crossing [April].

I followed a previous suggestion and stayed in Santa Teresa [Same hostal, straight on when entering town and last on right before dirt. Marked with a H, glass doors to bike parking inside.]

I paid for Minibus to the Hydro for 5 soles with workers.

There is an early train 08.45, I happened to walk into the station as it arrived and thought it was a sign so i took it. Fantastic journey [28USD] Glad I took it though, on the walk down the tracks i met a lot of tired people before they had even got the chance to roam all over Machu Picchu mountain.

Hope this helps someone else!