I have taken a video during night time of this tunnel while traveling by 12357 Exp in Dec, 2012. My video only consists of the tunnel tube lights since it was taken from the 2nd AC Coach seat window. My train slowed down for sometime between Gujhandi and Paharpur but it's best MPS performance was on sections like Dhanbad - Gomoh, Gomoh - Parasnath, Paharpur - Gaya and Dehri - Mughalsarai... Gaya - Dehri stretch was also quite impressive :-)