2006-07-24 23:30:30 · 7 answers · asked by Martin 4 in Cars & Transportation ➔ Commuting
About half of the dust is iron. The proportion of asbestos is small and not dangerous; dangerous forms of asbestos were removed in the 80's. "The composition of tunnel dust reflects exactly what might be expected from the source of dust. The high iron content results from wear on the rims and flanges of the wheels and on the heads of the rails and by contact between the moving wheels and the track (HSE 1981). The quartz content comes mainly from wear on the brake blocks which, for the older blocks, contained significant proportions of quartz. Asbestos was at one time of concern because the brake blocks contained 5% white asbestos (considered the least hazardous of the asbestos types)." "Other sources of dust are the gradual wear of ballast, oily matter from lubricating systems, engineering work on the track and track bed and track reconditioning, wear on clothing and particles brought in by passengers and through the ventilation system."
2006-07-25 00:12:02 · answer #1 · answered by Stephen C 2 · 3⤊ 0⤋
Dust from the Brake pads on the trains.
2006-07-24 23:34:30 · answer #2 · answered by Random Sam 2 · 0⤊ 0⤋
Break dust from the trains
2006-07-24 23:33:35 · answer #3 · answered by Dez 3 · 0⤊ 0⤋
Brake dust, human skin cells, rat poo, all sorts of things.
Definitely a 'wash your hands' situation if you get it on yours.
2006-07-24 23:42:01 · answer #4 · answered by Trish D 5 · 0⤊ 0⤋
The coal from the trains, oops i forgot we were in year 2006, sorry! Its the dust from the brakes, rats poop, mouse poop, bat poop. you get the idea?
2006-07-24 23:38:25 · answer #5 · answered by me 4 · 0⤊ 0⤋
dirt, dust, rat droppings.
2006-07-24 23:33:58 · answer #6 · answered by jude 6 · 0⤊ 0⤋
pouultion fumes dirt etc
2006-07-24 23:34:03 · answer #7 · answered by Anonymous · 0⤊ 0⤋