Hi Draje, the 29750 is a set from 2004
The loco is a Delta-Digital
You have the white MS that is a bit outdated and might need, if possible, to upgrade to the latest, for that model, software version. You can use it as is anyway, not a problem.
You have to decide if you want to have 3 rail tracks like the ones you have in the start set and you'll be bound to only Marklin locos, out of the factory, that have the slider underneath.
You can convert 2 rail locos, like Roco for example, so that they can use a slider and run on 3 rails.
If the selection of locomotices appeals to you more in the ones for the 2 rail tracks then, discard Marklin products and the 3 rail C tracks.
Once you have made up your mind on this we can tackle other topics. Pointless talking about digital and the lot now 😁

I model Swiss, but my collection includes the EN Wiener Walzer with its MAV coaches to Budapest. I run the Maerklin AC system with cars and coaches from multiple manufacturers.
My MAV (modern) coaches are from ACME and NMJ. New releases are slated for 2025-2026 (ACME)
LSM recently released a MAV Start sleeper (ex-Wagonservice) and additional limited night train sets from Naumann in Cologne.
I saw one shop in Hungary who still had the Naumann set listed as available.

Regards

Mike C

Always nice to see when others have interest in a eastern european country railway :)
The brands you speak of i never heard of, will look them up. I am guessing the run on 2 rail ?

Shops i think is okay, a whole lot in belgium, netherlands and germany who ship. ( Also catawiki auction is somethings a nice catch ( did it with modelcars 1/12 and 1/18 previously)
The issue will be, how to find 'old'models.

I don't know if that controller will recognise 3-rail locos from other manufacturers. Consider updating to an MS2 controller if you continue with Marklin.

Roco, Brawa and other manufacturers make three-rail versions of many of their locos and have the sliders fitted at the factory. Checking the catalogues will show the model number of the three-rail versions. With locos from other makers, you'll need to change the default digital address on the decoder chip with something like ESU's Lokprogrammer. Brawa's 3-rail locos all come from the factory with address number '3'. Having two locos on the same layout with the same address will cause problems, regardless of who makes the loco.

Most of of Marklin's locos are available in 2-rail versions under the Trix brand. You can run most two-rail locos and wagons from other manufacturers on a Trix layout. You can't mix Trix C-track with Marklin C-track. 2-rail systems use one positive rail and one ground rail. 3-rail track has both rails as ground, with positive coming via the centre studs. For that reason, you can't mix Trix C-track with Marklin C-track. This also affects other things like like reverse loops and some track-triggered automated functions.

Well i am not bonded to marklin, but the more i look the less i need to go for marklin but go for other brands because of the choice i have for my type of models i want.
I know that if i go elsewhere, i can't use anything that i have right now.
Question then is, which tracks do i go for then and which brands are the best quailty in details after marklin ? Roco and trix seems very detailed online.

Hi Mike,

Those are some nice sets. Also those shops are a good reference, will take a look, seems like a lot more choice in other brands than when i go with marklin. I think i made my choice there almost;
Now to figure out the tracks for the different models