The Garratts were not popular with the crews. One of the advantages of a Garratt is its flexibility but this was a disadvantage on the G&Q. With sharp curves and vertical rock walls on the inside of a curve the engineer's vision ahead was completely blocked with the tank swinging into the curve. The G&Q then and now suffered from rock slides, mud slides and washouts. The original square tanks were rebuilt with cylindrical tanks to improve visibility but evidently did not help much as one of the Garratts wound up in the Chan Chan river, several hundred feet below track level. The water tank at Yaquachi and the fuel bunker at the Duran shops were of the cylindrical pattern.
The Garratt's TE of 43,000 pounds versus the 2-8-0's TE of 32,800 pounds was not enough to make up for twice the mechanical complexity and the vision problem. All were reportedly out of use by 1955.
On another note, G&Q # 58 was and is the last steam locomotive built by Baldwin, by that time Baldwin/Lima/Hamilton. Builders number 75590, it was delivered in 1951, along with sister locos 53-57. I'm guessing this order put the Garratt's out of business.
Michael Allen