Hi friends
Finally after many years I have spent some time restoring and building my older Märklin H0 train set.
However I have a problem I do not know if anyone is familiar with.
The speed control (cannot insert images sadly, dont know how to). A blue box 12 x 12 cm with a grey aluminium sticker with speed control 0-250.
Most of my trains do not start until I come up over 100. Then they move slowly. Is this normal?
I measured the voltage on the track and that gives the following result;

Setting on speed control - Voltage on tracks
1 6,3V
50 8,3V
100 10,6V
150 13V
200 15,5V
250 17,6V

Some locomotives move better that others at the same setting on the speed control.
This system is alternating current.
I have checked the rubber tires and exchanged it, no change.
All tracks are polished and work great.

Any ideas why this happens and what the cause might be?
Any way to correct it?

Hi Sebastian,

If many years have indeed passed since the last time your locomotives got some exercise, this behaviour sounds like what one might expect.

If you run them for a few minutes, will they start gradually moving faster? Typically this is the case, indicating that old lubrication has hardened and needs a bit of warming up..

Like märklinist5999 said, the locomotives probably need some cleaning and perhaps a few replacement parts.

I have cleaned all locomotives, forgot to tell that in my original post, sorry. Did that the last few days so they are new out of service.
One of the 3030 locomotive is running smoothly no problems, the older ones, steam engines (no smoke sadly) and a tram are extremely slow, I like slow speeds so no problems but they should at least move :)