Well, let's look at them in order.
Marlon
See pictures of the Clinton-Golden Valley RR
Good advice above. I have to ask why you love Roco switches if they give you such headaches. Anyway, one more thing to check, and that is that the fastener (I forget if it is a screw or a rivet) that holds the movable rail is snug enough to keep the rail from twisting and not staying in tight contact with the straight rail. It can't be too tight, because the rail has to move, but it has to be tight enough to keep the rail upright. One of the culprits, if you do find an issue here, is commonly physically aggressive track cleaning.
The loco is probably losing power because either the turnout frog is not powered and the power pick up arrangement on the loco is such that it cannot bridge the dead length, or the moveable rail is so loose, as alluded to above, that it is not getting power fed to it through the connection, or some of the pick up strips for the wheels on the engine are not making good contact - and yes this is common on new locos. Unfortunately there is more to it than just clean track and a new loco. There probably shouldn't be, but there is.
From the far, far reaches of the wild, wild west I am: rtpoteet
colourclassic wrote:Hi, I have ROCO switches and my trains derail very easily on them as well as losing power on certain parts, is there a way to prevent this? The wheel flange goes between the sold outer rail and the "moving" inner rail and goes straight instead of turning, then it comes off the track. Also why would the engine lose power? the track is clean and the engine is new.
DERAILING: Sounds like (1).some wheel is picking the points, and (2). power is lost by either 'shorting' or (3). not receiving power through the frog.
(1) Picking points: (a) file a champfer (45o angle) across the top/edge of the offending point rails to 'nudge' the wheel flanges as they pass over. Kalmbach Books have instructions and pictures how to do. (b) Check wheels so they are all in-gauge. (c) replace the swich - in that order. Mass-produced (prefab) turnouts are difficult to produce totally-in gauge due to necessary mfg.(+/-) tolerances.
(2). If ROCO SWITCHES are 'Power Routing'types: the point rails will need to get power from the "outside" or stock rails via external SPDT points. Metal/metal contact is unreliable.
(3).Turnouts/switch points need a constant pressure to remain reliable. most switch machines will provide spring tension for that reason. You did not mention if you had switch machines? IF NOT, this could account for ALL the above.
Recommedation: Kalmbach book, NMRA gauge, and Switch macines with SPDT contacts.