BN 9503 is one of 4 AC drive demonstrator locomotives built in 1991-92 for Burlington Northern RR to test an AC drive system in heavy haul service. These 4 locomotives were the ancestors of the th... (more)

In 1991 EMD and BN jumped into the AC technology. EMD built 4 SD60MAC's prototype units for the BN to test out and were painted in a modified BN scheme. Tests proved successful and paved the road ... (more)

In 1991 EMD and BN jumped into the AC technology. EMD built 4 SD60MAC's prototype units for the BN to test out and were painted in a modified BN scheme. Tests proved successful and paved the road ... (more)

BN's SD60MAC demontrator units are shown here with some AAR test cars on a loaded coal train which is southbound on Union Pacific's Falls City Sub on Independence Day, 1993.

The bare ground parallel to this southbound coal train is now occupied by RTD's first light rail line.

Three Burlington Northern EMD SD60MACs power Soo Line No. 430 through a lazy s-curve along the Mississippi River south of Bellevue, Iowa, on October 17, 1993. Soo was testing these locomotives at ... (more)

One of four SD60MACs built by EMD.

Two rare (of only four built) SD60MACs demonstrate the abilities of AC-motored power on a CSX unit coal train. Accompanied by an EMD test car, the duo is at the very foot of Elkatawa Hill. The loa... (more)

EMD fielded four SD60MACs in BN paint in 1991. Two of the units are shown testing on CSX at Gentry, KY. The pair is pulling a northbound coal train from Hazard to Ravenna, on the Eastern Kentucky ... (more)

Soo Line tested the Burlington Northern SD60MACs in 1993. Here, Nos. 9500, 9503 and 9502 are leading Soo Line train No. 430 and is meeting train No. 431 led by a Soo SD60 at Green Island, Iowa, on... (more)

Three BN test SD60MACs lead train 20 east through Rapids on the MRL. Interesting paint scheme.

One of the Burlington Northern/EMD SD60MAC demonstrators leads a BNSF coal train headed around the upper horseshoe on Crawford Hill. April, 1998. A four-set of BN SD40-2's with a fuel tender push ... (more)

Soo Line tested the Burlington Northern SD60MAC demonstraters in 1993. Here, Nos. 9500, 9503 and 9502 are leading Soo Line train No. 430 through the Iowa countryside north of Green Island on Octob... (more)

The sun peaks out for a moment to shine on one of four SD60MAC's produced that were tested by the BN in the 90's. This one is now used for testing purposes at the EMD LaGrange plant.