( ( ( ( Route Miles ) : ) ( ( The length ) ( of ( ( ( a ( railroad line ) ) , ) ( regardless ( of ( ( the number ) ( of tracks ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Route) (NNP Miles)) (: :) (NP (NP (DT The) (NN length)) (PP (IN of) (NP (NP (DT a) (NN railroad) (NN line)) (, ,) (ADVP (RB regardless) (PP (IN of) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS tracks))))))))) (. .)))
Route Miles : The length of a railroad line, regardless of the number of tracks.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))