Sluggish operation on Unitrack

[Bikerdad]

I'm experiencing a rather odd phenomena on my little 2x4 oval of Kato Unitrack. My locomotives always slow down on the straits, even directly over the power feed. Hit the curve, they speed up, back on the straight, sloooowwww down. Any ideas what may be causing this, and what the solution may be?

 

[Russ Bellinis]

Do you have a digital voltmeter? You may have a voltage drop on the straight sections. Sounds like you have some bad electrical connections between track sections.

 

[60103]

Are the wheels slipping or does the motor slow down? Is it steam or diesel?
Sometimes, locos make better contact on curves because the wheels are pushed against the rails; this could mean better power pickup and/or better traction.