BNSF 5744 (ES44AC) waits on the siding at Tonville, Colorado as a large thunderstorm produces a rainbow in the background.

BNSF 7664 (ES44DC) leads the fast Z Train through the trees at Tonville, Colorado as it heads east on the Brush Sub.

A bright Colorado sunrise greets BNSF 7664 (ES44DC) as it leads a stack train through Tonville, Colorado on the Brush Sub.

A massive thunderstorm cell has just moved through Tonville, Colorado, creating a rainbow that frames BNSF 5744 (ES44AC) which is waiting on a siding for a green signal to head to Denver.

BNSF 8512 (SD70ACe) runs east on the Brush Sub through Tonville, Colorado at sunrise.

BNSF 8512 (SD70ACe) leads an empty coal train east on the Brush Sub through Tonville, Colorado.

Canadian Pacific #8111 (AC4400CWM) shoves a loaded coal west on the Brush Sub through Tonville, Colorado on its way to Denver.

BNSF 7829 (ES44DC) runs west on the Brush Sub towards Denver, Colorado.

BNSF 2028 (GP38-2) leads a cut of oil cans west on the Brush Sub through Tonville, Colorado.

BNSF 1958 (SD40-2) leads a stack train east on the Brush Sub through Tonville, Colorado.

BNSF 5628 (AC4400CW) leads a power heavy manifest east on the Brush Sub through Tonville, Colorado.

BNSF 2028 (GP38-2) leads the Hudson Local west on the Brush Sub towards Denver, Colorado on the Brush Sub.

BNSF 9218 (SD70ACe) leads a loaded coal train west on the Brush Sub through Tonville, Colorado.

Amtrak engine #203 (Operation Life Saver P42DC) runs through ground fog at Tonville, Colorado as it heads to Denver on the Brush Sub.

BNSF 6434 (ES44AC) shoves an oil can train through Tonville, Colorado as it heads to Denver, Colorado on the Brush Sub.