Colorado Pursuit — Marshall Grover

THE STAKES WERE HIGH AND DANGER RODE IN THEIR SHADOW!
The owlhoot pack was moving north, led by Craig Harnsey, the audacious bandit who had fooled the lawmen of Winfield County. Their destination was a lonely section of the railroad route, their goal a bank strongbox.
In hot pursuit came Larry and Stretch, the West's busiest troubleshooters, ignoring the risks and plunging headlong into danger.
Also involved in this hectic adventure were the misfits -- Homer Peck, the jilted railroad guard embarking on a brief career of grand larceny; Burch Tatum Junior, the clumsiest Ranger ever to ride out of the Lone Star State; Red Ruthy, the salty ranch girl who hankered to tangle with a horse thief.

Leonard Frank Meares (February 13, 1921 - February 4, 1993)
Sydney born Len Meares aka Marshall Grover, published around 750 novels, mostly westerns. His best-known works feature Texas trouble-shooters Larry and Stretch. Before starting to write, Meares served in the Royal Australian Air Force, worked in the Department of Immigration and sold shoes. In the mid-1950s he bought a typewriter to write radio and film scripts. Inspired by the success of local paperback westerns, he wrote Trouble Town, which was published by the Cleveland Publishing Company in 1955.
His tenth yarn, Drift! (1956), introduced Larry Valentine and Stretch Emerson. In 1960, he created a brief but memorable series of westerns set in and around the town of Bleak Creek. Four years later came The Night McLennan Died, the first of more than 70 westerns (sometimes called oaters) to feature cavalryman-turned-manhunter Big Jim Rand.