Is the weight difference between an empty and busy DMU have a noticeable impact on performance?

[FtoE]

In a DMU, is the carriage so heavy itself that it doesn’t make a huge difference to its performance if it is full of passengers or not?

 

[hexagon789]

In a DMU, is the carriage so heavy itself that it doesn’t make a huge difference to its performance if it is full of passengers or not?

I understand it makes enough of a difference to be just noticeable, particularly on older trains with lesser performance.

Braking is usually keener crush laden though, due to the weight loading built into the braking system being designed to overcompensate slightly.

 

[SuspectUsual]

In a DMU, is the carriage so heavy itself that it doesn’t make a huge difference to its performance if it is full of passengers or not?

I understand it makes enough of a difference to be just noticeable, particularly on older trains with lesser performance.

Braking is usually keener crush laden though, due to the weight loading built into the braking system being designed to overcompensate slightly.

Using a class 101 DMCL (I think) as an example, it weighs 32.5 tonnes and has about 65 seats. So if we assume an average of 80kg per passenger fully laden that would be an additional 5.2 tonnes of weight or about 16%. So a fair chunk extra.

(Not sure if the quoted vehicle weight includes fuel - if not a full tank adds about another 0.7 tonnes)