"growing order book" is correct and usable in written English.
You can use it to refer to a situation where a company, or other entity, is receiving an increased number of orders. For example, "The CEO was pleased to see that the company had a growing order book this quarter."
While at Boeing, with the size of the global fleet expected to double in the next 20 years (not counting the 87% that will be retired) and fuel accounting for as much as 40% of airline operating costs, it's no surprise that its super efficient 787 has built the fastest growing order book in aviation history (despite some hiccups).
Sales are back up, the head count is now up to 130, and Acme reckons it will hire 20 more people this year to handle the growing order book.In this section Rustbelt recovery The elephant in the waiting-room Time for second thoughts?
Engineering firms and construction companies, like Murray & Roberts of South Africa, have a rapidly growing order book.
But the company still has an impressive multinational client base and a growing order book; and it has assembled promising partnerships with such companies as Reuters.
"With a strong and growing order book, this further investment in the Broughton site will help reduce weather-related down-time for our key transport link and ensure we meet our delivery commitments".
Manufacturers in most countries this week reported rapidly growing order books.
Taiwan's orders turned down in July, but South Korean and Indian companies were still reporting growing order books.
Companies with growing order books are spending on capital goods: fixed-capital investment grew at an annualised 7.2% in the last quarter of the year, while the outlook for machinery orders looks buoyant.
"It really is just a matter of time before employers elect to address the fact that their depleted work forces are insufficient to deal with robust and growing order books".
Its order book grew by more than a fifth last year.
Latith Kahalaf, an analyst at Hargreaves Lansdown, said: "Keeping the order book growing requires constant investment into new product development," he said.
