"speed order" meaning in English

{
  "forms": [
    {
      "form": "speed orders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "speed order (plural speed orders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1961 March, \"\"Balmore\"\", “Driving and firing modern French steam locomotives”, in Trains Illustrated, page 147",
          "text": "We had a long 20 m.p.h. speed order of perhaps 7 miles' duration some 60 miles from Aulnoye and André told me to get some 8min in hand with our heavy train to offset this. [...] When we had passed the speed order, we were about 4min behind time, but we had regained nearly all the time by Creil.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "a (temporary) speed restriction."
      ],
      "id": "en-speed_order-en-noun-8tf2LXYy",
      "links": [
        [
          "observe",
          "observe"
        ],
        [
          "temporary",
          "temporary"
        ],
        [
          "restriction",
          "restriction"
        ]
      ],
      "qualifier": "An order to observe",
      "raw_glosses": [
        "(An order to observe) a (temporary) speed restriction."
      ]
    }
  ],
  "word": "speed order"
}

{
  "forms": [
    {
      "form": "speed orders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "speed order (plural speed orders)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1961 March, \"\"Balmore\"\", “Driving and firing modern French steam locomotives”, in Trains Illustrated, page 147",
          "text": "We had a long 20 m.p.h. speed order of perhaps 7 miles' duration some 60 miles from Aulnoye and André told me to get some 8min in hand with our heavy train to offset this. [...] When we had passed the speed order, we were about 4min behind time, but we had regained nearly all the time by Creil.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "a (temporary) speed restriction."
      ],
      "links": [
        [
          "observe",
          "observe"
        ],
        [
          "temporary",
          "temporary"
        ],
        [
          "restriction",
          "restriction"
        ]
      ],
      "qualifier": "An order to observe",
      "raw_glosses": [
        "(An order to observe) a (temporary) speed restriction."
      ]
    }
  ],
  "word": "speed order"
}