Verbal Ability - Spotting Errors - Discussion

"On behalf of " means that someone does it for someone else, or for a larger group that they are part of.
"On the part of'' and "on his/her/their part" means "by" or "from".

Consider:
"She\'s here to accept the reward on behalf of [for; in place of] her husband, who couldn\'t make it".
"On behalf of [speaking for everyone in] the organizing committee, we wish you an exciting evening".

"This plan should improve healthcare for everyone, but requires some sacrifices on the part of [by/from] the richest taxpayers".

"This is the result of a huge amount of work on her part [by her]".

"On behalf of " means that someone does it for someone else, or for a larger group that they are part of.

"On the part of" and "on his/her/their part" means "by" or "from".

Consider:

"She's here to accept the reward on behalf of [for; in place of] her husband, who couldn't make it".

"On behalf of [speaking for everyone in] the organizing committee, we wish you an exciting evening.

"This plan should improve healthcare for everyone, but requires some sacrifices on the part of [by/from] the richest taxpayers".

"This is the result of a huge amount of work on her part [by her].

The correct phrase should be either "caused by" or "due to," but not both. These phrases are similar in meaning but have different grammatical structures:

1) "Caused by" is used to indicate the agent or cause of something.
2) "Due to" is used to indicate the reason or explanation for something.

So, the corrected sentence could be:

"A lot of travel delay is caused by the inefficiency and lack of good management on behalf of the railways."
OR
"A lot of travel delay is due to the inefficiency and lack of good management on behalf of the railways."

On the part of used to ascribe responsibility for something to someone. E.G. "There was a series of errors on my part" synonyms: (made/done) by, carried out by, caused by.

In behalf of someone = For someone's benefit*.
On behalf of someone = As someone's agent*.

* This distinction no longer has a basis.

I believe that 'On behave of' uses for living human beings i.e. On behalf of me.

But on other side, 'On the part of' uses when it does NOT represent any living human beings such as railway or on part of private company.

Please correct me if I am wrong.

Thanks all for your valuable suggestion.

I think it is more appropriate using "most of" instead of using "A lot of".

I think on behalf of is generally used to give the idea that something is done because it should be done.

But there should not be delay but it happens.

So we can think it as "part of".

So on part of is more correct.

On behalf of means "as the agent of, on the part of," as in The guardian signed the contract on behalf of the minor child.
on the part of
Regarding or with respect to (the one specified): Brilliant strategy on the part of Confederate forces ensured their victory at Chancellorsville.

We use 'on the behalf of' for favorable things or for good things. We do not use this for errors and for wrong things. For example. He kidnapped me on the behalf of Don. This sentence is wrong. In above sentence the same thing is happening that's why 'on the behalf is wrong' in that sentence.

On behalf of means representing someone.

For example: the Head girl can start her speech,
On behalf of the students, I take the opportunity to thank the Chief guest.

On part of means by or from someone.

For example, The flood donation was given on part of the school students.

On behalf of is used 'to represent someone' or 'for someone'..

On the part of is used for 'to represent who is responsible for the cause or action'....

In the above question since railway is responsible for the cause we could us 'on the part of' ....