RailPro User Group

RailPro => RailPro Specific Help & Discussion => Topic started by: mickey on June 21, 2024, 09:54:20 PM

Title: LM-3 vs LM-4
Post by: mickey on June 21, 2024, 09:54:20 PM
In the G scale, what exactly is the difference between these?  I have 2 of the older 3 and 5 of the 4’s. Before I select which engine to install them are there significant differences?
Title: Re: LM-3 vs LM-4
Post by: William Brillinger on June 22, 2024, 06:21:43 AM
According to Ring Engineering:

August 2022, New Product - RailPro LM-4S-G
The LM-4S-G adds analog control and higher voltage capability for our G scale loco modules.

You can compare the manuals here:
https://ringengineering.com/RailPro/Documents/LM-3SGInstructions.pdf
https://ringengineering.com/RailPro/Documents/LM-4SGInstructions.pdf
Title: Re: LM-3 vs LM-4
Post by: mickey on June 22, 2024, 07:57:57 AM
So in my case, installing on a number of different Bachmann engines, like the Shay, 3 truck Shay, Climax, 2-6-6-2, Heisler each with 2 motors, I should use the LM-4 and save the LM-3's for the likes of the 4-4-0, K27, C19, Rail truck and AMS Goose due to possible juice requirements?
Title: Re: LM-3 vs LM-4
Post by: snowdog on June 25, 2024, 10:06:32 PM
The basics are that the LM4s are for scales larger than HO. It is designed to work with higher input voltages and current draws the larger units need. An LM3 will probably burn up in a G-scale unit!
Title: Re: LM-3 vs LM-4
Post by: William Brillinger on June 26, 2024, 06:28:56 AM
Quote from: snowdog on June 25, 2024, 10:06:32 PM
The basics are that the LM4s are for scales larger than HO. It is designed to work with higher input voltages and current draws the larger units need. An LM3 will probably burn up in a G-scale unit!

Snowdog: There is a G Scale version of the LM-3. It's call the LM-3S-G. It was replaced by the LM-4S-G some time ago.