This may be your first time writing a report because there are lots of mistakes.
" during 1974 to 2002". Totally wrong phrase. It could be "during a 28-year period from 1974 to 2002"
You should use more adverb to indicate inaccurate number like "approximately, around, nearly"
Like this sentence "around 70 million tonnes of ..."
The conclusion is not necessary and you should learn more how to write task 1 IELTS.
The biggest problem is that you don't split up sentences, leading to a mess in both paragraphs. You should fix in this way
"As can be seen from the line... Meanwhile, pipeline started with ..."
".In detail,the amount of goods ... Besides, rail still maintained ..."
You should check your spelling before submitting or no one will give you feedback. At some point, I think you are writing another language.