"# 539 steam Locomotive hauling muck train from the dump hopper at the low level mixing plant for the disposal of tunnel muck along the right-of-way above the river-camp, which is seen in the background. January 28th, 1932.
#537 Four 90-ton consolidation type locomotives are now
in use by Six Company Inc. View shows first trainlond of gravel arriving at the screening plant. January 9th, 1932.
#541 View looking downstream at the site of the low level mixing plant. Track hopper and gravel conveyor to mixing plant in the center. View shows three of Six Companies' locomotives engaged in hauling tunnel muck from the dump hopper seen in the background.
# 540 Muck train dumping along railroad right-of-way,
upstream from the river camp. View shows western side-dump drop-door type of cars in use. January 28th, 1932.