Like Trainman, I used my digital calipers as a scribe to first measure the depth to be removed from LIONEL bridge piers to achieve a rail height equal to that provided by LIONEL's "A" trestles.
First, the calipers were used to measure the depth of the material to be removed; and then I used the calipers to scribe both plastic piers to mark how much material to remove. Came out great.
