I just received a replacement loco with knuckle couplers installed , and with a packet of replacement Rapido couplers.

Eventually I want to change everything to the knuckle style, but everything I have now is Rapido. I have just spent the last 1/2 hour trying to find some help on how to make the change to Rapido. - with no result.

I know it's probably "duck soup" to the experienced hand  - but it is an absolute mystery to a newbie like me.

Can any one point me to an illustrated "how to" guide?

what is the recommended minimum radius for the PTC Streamline trolley (#62995)?

I have an HO McKinley Explorer train set. I cannot keep the cars coupled.  The diesel will not couple to any one of the cars.  I've tried both ends of all 4 cars.  The cars usually will not automatically couple to one another. I have to hand thread them together, as well as the diesel.  What a pain in the #$&*^& that is!

Is there any suggested solution other than spending more money on changing couplers - I'd probably opt to change the trucks at the same time.  When these puppies derail it's usually because one of the wheel sets has dislodged and either derails the same car or the one trailing.

Before you say it is probably the track, A 1947 Varney Lil' Joe Dockside 0-4-0 pulls a string of 5 or 6 cars around on the same track with no problem.  This consist is mixed freight.  Some are Bachmann cars.

This is not a used set from eBay.  I bought it NIB from Holland American while riding on the McKinley Explorer from Denali to Anchorage.

Suggestions welcome!

I cannot keep the cars coupled.  The diesel will not couple to any one of the cars.  I've tried both ends of all 4 cars.  The cars usually will not automatically couple to one another. I have to hand thread them together, as well as the diesel.  What a pain in the #$&*^& that is!

Is there any suggested solution other than spending more money on changing couplers - I'd probably opt to change the trucks at the same time.  When these puppies derail it's usually because one of the wheel sets has dislodged and either derails the same car or the one trailing.

Before you say it is probably the track, A 1947 Varney Lil' Joe Dockside 0-4-0 pulls a string of 5 or 6 cars around on the same track with no problem.  This consist is mixed freight.  Some are Bachmann cars.

This is not a used set from eBay.  I bought it NIB from Holland American while riding on the McKinley Explorer from Denali to Anchorage.

Suggestions welcome!