Still within the lifetime of some of us here, the LIRR wreck of 11/22/50 in Richmond Hill (Kew Gardens) stands out as a tragic example of telescoping. Read about it here:
http://www.richmondhillhistory.org/LIRRcrash.html
http://www.richmondhillhistory.org/LIRRcrash.html
Ocala Mike (formerly Hillside Mike and Deer Park Mike)