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Z21 + DCC-EX and iTrain (low-cost signal control 0.7€/output)

Posted on 2026-01-182026-01-30 by rmolins

This post explains how to increase the number of controllable signals of a model railway from iTrain in an economical way, with an approximate cost of 0.7€/output using DCC-EX. I control the locomotives and turnouts with the ROCO Z21 application or from iTrain. The problem is that to control traffic signals and building lights to…

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Coal load for freight wagon

Posted on 2026-01-082026-01-30 by rmolins

Steps to create a coal load for an open-top freight wagon. It takes around 10 minutes per wagon but could be reduced if done in batches. Steps:

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Forest area base and ballast

Posted on 2026-01-022026-01-30 by rmolins

Preparation of the forest was done by cutting a wood to shame and gluing brown and light brown dirt. Ballasting was done as always but with different ballast from Noch. White dots represent placement for trees.

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Improving the bridges

Posted on 2025-11-302026-01-30 by rmolins

The layout has two bridges. One in the back composed by NOCH-21320 and one in the front composed by NOCH-21320 + 2x NOCH-21350 and the piers from NOCH-21400. The original bridge was grey, which is a common colour seen in this kind of layouts, but I felt it looked as cheap plastic. I decided to…

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DIY Trees for H0 scale

Posted on 2025-11-302026-01-30 by rmolins

I want to create a small forest in my layout. Trees are expensive and most of they feel like plastic. I decided to attempt to create a tree by using wire and rope. The process is straightforward but hard to master. I have tried different variations, in order from left to right: These attempts do…

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DIY Programming on siding track with Z21 Starter

Posted on 2025-10-132026-02-01 by rmolins

I sometimes want to program CV to one locomotive without the need to remove other locomotives from the track (POM). To avoid this, added a siding with a DPDS connected to the Z21 white. This allows to bring a loco to the siding, change the switch, program the loco and after changing the switch again…

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Industrial diorama

Posted on 2025-09-252026-02-14 by rmolins

Before adding a railway crossing to my layout, more experience was needed. This triggered the construction of a small industrial diorama. This diorama would add a first experience of road and railroad crossing construction and building painting. The construction was straightforward: wooden base, white plaster for the road, static grass and an old building I…

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Making a wire tree

Posted on 2025-09-132026-02-14 by rmolins

I started by using garden wire. To create the structure of the tree. Then the structure is covered with modpodge mate glue. I sprayed the top with glue and added some grass to act as a small branches, it did not work as expected. Everything was then painted with airbrush. I ended up gluing coarse…

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Railway crossing internal circle

Posted on 2025-09-132026-02-14 by rmolins

The internal circle railway crossing is made with the same process as the one of the external circle.

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Railway crossing external circle

Posted on 2025-09-122026-02-14 by rmolins

The external loop had a “dirt road” and a tunnel entrance that needed some improvement. After removing the dirt and cleaning, plaster was used to make a more leveled countryside road. Using a knife and an old wagon ensured clearance on the rails. Once the plaster is dry it is painted, ballast added to the…

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Recent Posts

  • Z21 + DCC-EX and iTrain (low-cost signal control 0.7€/output)
  • Coal load for freight wagon
  • Forest area base and ballast
  • Improving the bridges
  • DIY Trees for H0 scale

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