different between grainless vs trainless

English

grain +? -less

grainless (not comparable)

Without grain.
grainless silage
Free from grainy texture or appearance.
- 1934, Popular Science (volume 125, number 4, page 78)
  making grainless enlargements
- 1973, Popular Mechanics (volume 139, number 1, January 1973, page 52)
  Highlights start blocking up and shadows turn to featureless black far sooner than on normal films — but the shadows are a very lovely black, because shadow areas of the two new films are clear and grainless.

Salingers, arselings, glariness, resignals, salerings, sangliers, seal rings, signalers

train +? -less

trainless (not comparable)

Without a train (in various senses).
- 1867, The Popular science review, Volume 6 (page 82)
  At the radiant point itself, it was a subject of general remark, the meteors appeared trainless, and shone out for a moment like so many stars...
- 1982, The Economist, Volume 284 (page 43)
  Mr Ray Buckton, the Aslef boss, is as miserable as most trainless commuters, though most of the public sees him as the villain.

Send